1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * TI TRF7970a RFID/NFC Transceiver Driver 4 * 5 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com 6 * 7 * Author: Erick Macias <emacias@ti.com> 8 * Author: Felipe Balbi <balbi@ti.com> 9 * Author: Mark A. Greer <mgreer@animalcreek.com> 10 */ 11 12 #include <linux/module.h> 13 #include <linux/device.h> 14 #include <linux/netdevice.h> 15 #include <linux/interrupt.h> 16 #include <linux/pm_runtime.h> 17 #include <linux/nfc.h> 18 #include <linux/skbuff.h> 19 #include <linux/delay.h> 20 #include <linux/gpio/consumer.h> 21 #include <linux/of.h> 22 #include <linux/spi/spi.h> 23 #include <linux/regulator/consumer.h> 24 25 #include <net/nfc/nfc.h> 26 #include <net/nfc/digital.h> 27 28 /* There are 3 ways the host can communicate with the trf7970a: 29 * parallel mode, SPI with Slave Select (SS) mode, and SPI without 30 * SS mode. The driver only supports the two SPI modes. 31 * 32 * The trf7970a is very timing sensitive and the VIN, EN2, and EN 33 * pins must asserted in that order and with specific delays in between. 34 * The delays used in the driver were provided by TI and have been 35 * confirmed to work with this driver. There is a bug with the current 36 * version of the trf7970a that requires that EN2 remain low no matter 37 * what. If it goes high, it will generate an RF field even when in 38 * passive target mode. TI has indicated that the chip will work okay 39 * when EN2 is left low. The 'en2-rf-quirk' device tree property 40 * indicates that trf7970a currently being used has the erratum and 41 * that EN2 must be kept low. 42 * 43 * Timeouts are implemented using the delayed workqueue kernel facility. 44 * Timeouts are required so things don't hang when there is no response 45 * from the trf7970a (or tag). Using this mechanism creates a race with 46 * interrupts, however. That is, an interrupt and a timeout could occur 47 * closely enough together that one is blocked by the mutex while the other 48 * executes. When the timeout handler executes first and blocks the 49 * interrupt handler, it will eventually set the state to IDLE so the 50 * interrupt handler will check the state and exit with no harm done. 51 * When the interrupt handler executes first and blocks the timeout handler, 52 * the cancel_delayed_work() call will know that it didn't cancel the 53 * work item (i.e., timeout) and will return zero. That return code is 54 * used by the timer handler to indicate that it should ignore the timeout 55 * once its unblocked. 56 * 57 * Aborting an active command isn't as simple as it seems because the only 58 * way to abort a command that's already been sent to the tag is so turn 59 * off power to the tag. If we do that, though, we'd have to go through 60 * the entire anticollision procedure again but the digital layer doesn't 61 * support that. So, if an abort is received before trf7970a_send_cmd() 62 * has sent the command to the tag, it simply returns -ECANCELED. If the 63 * command has already been sent to the tag, then the driver continues 64 * normally and recieves the response data (or error) but just before 65 * sending the data upstream, it frees the rx_skb and sends -ECANCELED 66 * upstream instead. If the command failed, that error will be sent 67 * upstream. 68 * 69 * When recieving data from a tag and the interrupt status register has 70 * only the SRX bit set, it means that all of the data has been received 71 * (once what's in the fifo has been read). However, depending on timing 72 * an interrupt status with only the SRX bit set may not be recived. In 73 * those cases, the timeout mechanism is used to wait 20 ms in case more 74 * data arrives. After 20 ms, it is assumed that all of the data has been 75 * received and the accumulated rx data is sent upstream. The 76 * 'TRF7970A_ST_WAIT_FOR_RX_DATA_CONT' state is used for this purpose 77 * (i.e., it indicates that some data has been received but we're not sure 78 * if there is more coming so a timeout in this state means all data has 79 * been received and there isn't an error). The delay is 20 ms since delays 80 * of ~16 ms have been observed during testing. 81 * 82 * When transmitting a frame larger than the FIFO size (127 bytes), the 83 * driver will wait 20 ms for the FIFO to drain past the low-watermark 84 * and generate an interrupt. The low-watermark set to 32 bytes so the 85 * interrupt should fire after 127 - 32 = 95 bytes have been sent. At 86 * the lowest possible bit rate (6.62 kbps for 15693), it will take up 87 * to ~14.35 ms so 20 ms is used for the timeout. 88 * 89 * Type 2 write and sector select commands respond with a 4-bit ACK or NACK. 90 * Having only 4 bits in the FIFO won't normally generate an interrupt so 91 * driver enables the '4_bit_RX' bit of the Special Functions register 1 92 * to cause an interrupt in that case. Leaving that bit for a read command 93 * messes up the data returned so it is only enabled when the framing is 94 * 'NFC_DIGITAL_FRAMING_NFCA_T2T' and the command is not a read command. 95 * Unfortunately, that means that the driver has to peek into tx frames 96 * when the framing is 'NFC_DIGITAL_FRAMING_NFCA_T2T'. This is done by 97 * the trf7970a_per_cmd_config() routine. 98 * 99 * ISO/IEC 15693 frames specify whether to use single or double sub-carrier 100 * frequencies and whether to use low or high data rates in the flags byte 101 * of the frame. This means that the driver has to peek at all 15693 frames 102 * to determine what speed to set the communication to. In addition, write 103 * and lock commands use the OPTION flag to indicate that an EOF must be 104 * sent to the tag before it will send its response. So the driver has to 105 * examine all frames for that reason too. 106 * 107 * It is unclear how long to wait before sending the EOF. According to the 108 * Note under Table 1-1 in section 1.6 of 109 * http://www.ti.com/lit/ug/scbu011/scbu011.pdf, that wait should be at least 110 * 10 ms for TI Tag-it HF-I tags; however testing has shown that is not long 111 * enough so 20 ms is used. So the timer is set to 40 ms - 20 ms to drain 112 * up to 127 bytes in the FIFO at the lowest bit rate plus another 20 ms to 113 * ensure the wait is long enough before sending the EOF. This seems to work 114 * reliably. 115 */ 116 117 #define TRF7970A_SUPPORTED_PROTOCOLS \ 118 (NFC_PROTO_MIFARE_MASK | NFC_PROTO_ISO14443_MASK | \ 119 NFC_PROTO_ISO14443_B_MASK | NFC_PROTO_FELICA_MASK | \ 120 NFC_PROTO_ISO15693_MASK | NFC_PROTO_NFC_DEP_MASK) 121 122 #define TRF7970A_AUTOSUSPEND_DELAY 30000 /* 30 seconds */ 123 #define TRF7970A_13MHZ_CLOCK_FREQUENCY 13560000 124 #define TRF7970A_27MHZ_CLOCK_FREQUENCY 27120000 125 126 #define TRF7970A_RX_SKB_ALLOC_SIZE 256 127 128 #define TRF7970A_FIFO_SIZE 127 129 130 /* TX length is 3 nibbles long ==> 4KB - 1 bytes max */ 131 #define TRF7970A_TX_MAX (4096 - 1) 132 133 #define TRF7970A_WAIT_FOR_TX_IRQ 20 134 #define TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT 20 135 #define TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT 20 136 #define TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF 40 137 138 /* Guard times for various RF technologies (in us) */ 139 #define TRF7970A_GUARD_TIME_NFCA 5000 140 #define TRF7970A_GUARD_TIME_NFCB 5000 141 #define TRF7970A_GUARD_TIME_NFCF 20000 142 #define TRF7970A_GUARD_TIME_15693 1000 143 144 /* Quirks */ 145 /* Erratum: When reading IRQ Status register on trf7970a, we must issue a 146 * read continuous command for IRQ Status and Collision Position registers. 147 */ 148 #define TRF7970A_QUIRK_IRQ_STATUS_READ BIT(0) 149 #define TRF7970A_QUIRK_EN2_MUST_STAY_LOW BIT(1) 150 151 /* Direct commands */ 152 #define TRF7970A_CMD_IDLE 0x00 153 #define TRF7970A_CMD_SOFT_INIT 0x03 154 #define TRF7970A_CMD_RF_COLLISION 0x04 155 #define TRF7970A_CMD_RF_COLLISION_RESPONSE_N 0x05 156 #define TRF7970A_CMD_RF_COLLISION_RESPONSE_0 0x06 157 #define TRF7970A_CMD_FIFO_RESET 0x0f 158 #define TRF7970A_CMD_TRANSMIT_NO_CRC 0x10 159 #define TRF7970A_CMD_TRANSMIT 0x11 160 #define TRF7970A_CMD_DELAY_TRANSMIT_NO_CRC 0x12 161 #define TRF7970A_CMD_DELAY_TRANSMIT 0x13 162 #define TRF7970A_CMD_EOF 0x14 163 #define TRF7970A_CMD_CLOSE_SLOT 0x15 164 #define TRF7970A_CMD_BLOCK_RX 0x16 165 #define TRF7970A_CMD_ENABLE_RX 0x17 166 #define TRF7970A_CMD_TEST_INT_RF 0x18 167 #define TRF7970A_CMD_TEST_EXT_RF 0x19 168 #define TRF7970A_CMD_RX_GAIN_ADJUST 0x1a 169 170 /* Bits determining whether its a direct command or register R/W, 171 * whether to use a continuous SPI transaction or not, and the actual 172 * direct cmd opcode or register address. 173 */ 174 #define TRF7970A_CMD_BIT_CTRL BIT(7) 175 #define TRF7970A_CMD_BIT_RW BIT(6) 176 #define TRF7970A_CMD_BIT_CONTINUOUS BIT(5) 177 #define TRF7970A_CMD_BIT_OPCODE(opcode) ((opcode) & 0x1f) 178 179 /* Registers addresses */ 180 #define TRF7970A_CHIP_STATUS_CTRL 0x00 181 #define TRF7970A_ISO_CTRL 0x01 182 #define TRF7970A_ISO14443B_TX_OPTIONS 0x02 183 #define TRF7970A_ISO14443A_HIGH_BITRATE_OPTIONS 0x03 184 #define TRF7970A_TX_TIMER_SETTING_H_BYTE 0x04 185 #define TRF7970A_TX_TIMER_SETTING_L_BYTE 0x05 186 #define TRF7970A_TX_PULSE_LENGTH_CTRL 0x06 187 #define TRF7970A_RX_NO_RESPONSE_WAIT 0x07 188 #define TRF7970A_RX_WAIT_TIME 0x08 189 #define TRF7970A_MODULATOR_SYS_CLK_CTRL 0x09 190 #define TRF7970A_RX_SPECIAL_SETTINGS 0x0a 191 #define TRF7970A_REG_IO_CTRL 0x0b 192 #define TRF7970A_IRQ_STATUS 0x0c 193 #define TRF7970A_COLLISION_IRQ_MASK 0x0d 194 #define TRF7970A_COLLISION_POSITION 0x0e 195 #define TRF7970A_RSSI_OSC_STATUS 0x0f 196 #define TRF7970A_SPECIAL_FCN_REG1 0x10 197 #define TRF7970A_SPECIAL_FCN_REG2 0x11 198 #define TRF7970A_RAM1 0x12 199 #define TRF7970A_RAM2 0x13 200 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS 0x14 201 #define TRF7970A_NFC_LOW_FIELD_LEVEL 0x16 202 #define TRF7970A_NFCID1 0x17 203 #define TRF7970A_NFC_TARGET_LEVEL 0x18 204 #define TRF79070A_NFC_TARGET_PROTOCOL 0x19 205 #define TRF7970A_TEST_REGISTER1 0x1a 206 #define TRF7970A_TEST_REGISTER2 0x1b 207 #define TRF7970A_FIFO_STATUS 0x1c 208 #define TRF7970A_TX_LENGTH_BYTE1 0x1d 209 #define TRF7970A_TX_LENGTH_BYTE2 0x1e 210 #define TRF7970A_FIFO_IO_REGISTER 0x1f 211 212 /* Chip Status Control Register Bits */ 213 #define TRF7970A_CHIP_STATUS_VRS5_3 BIT(0) 214 #define TRF7970A_CHIP_STATUS_REC_ON BIT(1) 215 #define TRF7970A_CHIP_STATUS_AGC_ON BIT(2) 216 #define TRF7970A_CHIP_STATUS_PM_ON BIT(3) 217 #define TRF7970A_CHIP_STATUS_RF_PWR BIT(4) 218 #define TRF7970A_CHIP_STATUS_RF_ON BIT(5) 219 #define TRF7970A_CHIP_STATUS_DIRECT BIT(6) 220 #define TRF7970A_CHIP_STATUS_STBY BIT(7) 221 222 /* ISO Control Register Bits */ 223 #define TRF7970A_ISO_CTRL_15693_SGL_1OF4_662 0x00 224 #define TRF7970A_ISO_CTRL_15693_SGL_1OF256_662 0x01 225 #define TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648 0x02 226 #define TRF7970A_ISO_CTRL_15693_SGL_1OF256_2648 0x03 227 #define TRF7970A_ISO_CTRL_15693_DBL_1OF4_667a 0x04 228 #define TRF7970A_ISO_CTRL_15693_DBL_1OF256_667 0x05 229 #define TRF7970A_ISO_CTRL_15693_DBL_1OF4_2669 0x06 230 #define TRF7970A_ISO_CTRL_15693_DBL_1OF256_2669 0x07 231 #define TRF7970A_ISO_CTRL_14443A_106 0x08 232 #define TRF7970A_ISO_CTRL_14443A_212 0x09 233 #define TRF7970A_ISO_CTRL_14443A_424 0x0a 234 #define TRF7970A_ISO_CTRL_14443A_848 0x0b 235 #define TRF7970A_ISO_CTRL_14443B_106 0x0c 236 #define TRF7970A_ISO_CTRL_14443B_212 0x0d 237 #define TRF7970A_ISO_CTRL_14443B_424 0x0e 238 #define TRF7970A_ISO_CTRL_14443B_848 0x0f 239 #define TRF7970A_ISO_CTRL_FELICA_212 0x1a 240 #define TRF7970A_ISO_CTRL_FELICA_424 0x1b 241 #define TRF7970A_ISO_CTRL_NFC_NFCA_106 0x01 242 #define TRF7970A_ISO_CTRL_NFC_NFCF_212 0x02 243 #define TRF7970A_ISO_CTRL_NFC_NFCF_424 0x03 244 #define TRF7970A_ISO_CTRL_NFC_CE_14443A 0x00 245 #define TRF7970A_ISO_CTRL_NFC_CE_14443B 0x01 246 #define TRF7970A_ISO_CTRL_NFC_CE BIT(2) 247 #define TRF7970A_ISO_CTRL_NFC_ACTIVE BIT(3) 248 #define TRF7970A_ISO_CTRL_NFC_INITIATOR BIT(4) 249 #define TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE BIT(5) 250 #define TRF7970A_ISO_CTRL_RFID BIT(5) 251 #define TRF7970A_ISO_CTRL_DIR_MODE BIT(6) 252 #define TRF7970A_ISO_CTRL_RX_CRC_N BIT(7) /* true == No CRC */ 253 254 #define TRF7970A_ISO_CTRL_RFID_SPEED_MASK 0x1f 255 256 /* Modulator and SYS_CLK Control Register Bits */ 257 #define TRF7970A_MODULATOR_DEPTH(n) ((n) & 0x7) 258 #define TRF7970A_MODULATOR_DEPTH_ASK10 (TRF7970A_MODULATOR_DEPTH(0)) 259 #define TRF7970A_MODULATOR_DEPTH_OOK (TRF7970A_MODULATOR_DEPTH(1)) 260 #define TRF7970A_MODULATOR_DEPTH_ASK7 (TRF7970A_MODULATOR_DEPTH(2)) 261 #define TRF7970A_MODULATOR_DEPTH_ASK8_5 (TRF7970A_MODULATOR_DEPTH(3)) 262 #define TRF7970A_MODULATOR_DEPTH_ASK13 (TRF7970A_MODULATOR_DEPTH(4)) 263 #define TRF7970A_MODULATOR_DEPTH_ASK16 (TRF7970A_MODULATOR_DEPTH(5)) 264 #define TRF7970A_MODULATOR_DEPTH_ASK22 (TRF7970A_MODULATOR_DEPTH(6)) 265 #define TRF7970A_MODULATOR_DEPTH_ASK30 (TRF7970A_MODULATOR_DEPTH(7)) 266 #define TRF7970A_MODULATOR_EN_ANA BIT(3) 267 #define TRF7970A_MODULATOR_CLK(n) (((n) & 0x3) << 4) 268 #define TRF7970A_MODULATOR_CLK_DISABLED (TRF7970A_MODULATOR_CLK(0)) 269 #define TRF7970A_MODULATOR_CLK_3_6 (TRF7970A_MODULATOR_CLK(1)) 270 #define TRF7970A_MODULATOR_CLK_6_13 (TRF7970A_MODULATOR_CLK(2)) 271 #define TRF7970A_MODULATOR_CLK_13_27 (TRF7970A_MODULATOR_CLK(3)) 272 #define TRF7970A_MODULATOR_EN_OOK BIT(6) 273 #define TRF7970A_MODULATOR_27MHZ BIT(7) 274 275 #define TRF7970A_RX_SPECIAL_SETTINGS_NO_LIM BIT(0) 276 #define TRF7970A_RX_SPECIAL_SETTINGS_AGCR BIT(1) 277 #define TRF7970A_RX_SPECIAL_SETTINGS_GD_0DB (0x0 << 2) 278 #define TRF7970A_RX_SPECIAL_SETTINGS_GD_5DB (0x1 << 2) 279 #define TRF7970A_RX_SPECIAL_SETTINGS_GD_10DB (0x2 << 2) 280 #define TRF7970A_RX_SPECIAL_SETTINGS_GD_15DB (0x3 << 2) 281 #define TRF7970A_RX_SPECIAL_SETTINGS_HBT BIT(4) 282 #define TRF7970A_RX_SPECIAL_SETTINGS_M848 BIT(5) 283 #define TRF7970A_RX_SPECIAL_SETTINGS_C424 BIT(6) 284 #define TRF7970A_RX_SPECIAL_SETTINGS_C212 BIT(7) 285 286 #define TRF7970A_REG_IO_CTRL_VRS(v) ((v) & 0x07) 287 #define TRF7970A_REG_IO_CTRL_IO_LOW BIT(5) 288 #define TRF7970A_REG_IO_CTRL_EN_EXT_PA BIT(6) 289 #define TRF7970A_REG_IO_CTRL_AUTO_REG BIT(7) 290 291 /* IRQ Status Register Bits */ 292 #define TRF7970A_IRQ_STATUS_NORESP BIT(0) /* ISO15693 only */ 293 #define TRF7970A_IRQ_STATUS_NFC_COL_ERROR BIT(0) 294 #define TRF7970A_IRQ_STATUS_COL BIT(1) 295 #define TRF7970A_IRQ_STATUS_FRAMING_EOF_ERROR BIT(2) 296 #define TRF7970A_IRQ_STATUS_NFC_RF BIT(2) 297 #define TRF7970A_IRQ_STATUS_PARITY_ERROR BIT(3) 298 #define TRF7970A_IRQ_STATUS_NFC_SDD BIT(3) 299 #define TRF7970A_IRQ_STATUS_CRC_ERROR BIT(4) 300 #define TRF7970A_IRQ_STATUS_NFC_PROTO_ERROR BIT(4) 301 #define TRF7970A_IRQ_STATUS_FIFO BIT(5) 302 #define TRF7970A_IRQ_STATUS_SRX BIT(6) 303 #define TRF7970A_IRQ_STATUS_TX BIT(7) 304 305 #define TRF7970A_IRQ_STATUS_ERROR \ 306 (TRF7970A_IRQ_STATUS_COL | \ 307 TRF7970A_IRQ_STATUS_FRAMING_EOF_ERROR | \ 308 TRF7970A_IRQ_STATUS_PARITY_ERROR | \ 309 TRF7970A_IRQ_STATUS_CRC_ERROR) 310 311 #define TRF7970A_RSSI_OSC_STATUS_RSSI_MASK (BIT(2) | BIT(1) | BIT(0)) 312 #define TRF7970A_RSSI_OSC_STATUS_RSSI_X_MASK (BIT(5) | BIT(4) | BIT(3)) 313 #define TRF7970A_RSSI_OSC_STATUS_RSSI_OSC_OK BIT(6) 314 315 #define TRF7970A_SPECIAL_FCN_REG1_COL_7_6 BIT(0) 316 #define TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL BIT(1) 317 #define TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX BIT(2) 318 #define TRF7970A_SPECIAL_FCN_REG1_SP_DIR_MODE BIT(3) 319 #define TRF7970A_SPECIAL_FCN_REG1_NEXT_SLOT_37US BIT(4) 320 #define TRF7970A_SPECIAL_FCN_REG1_PAR43 BIT(5) 321 322 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_124 (0x0 << 2) 323 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_120 (0x1 << 2) 324 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_112 (0x2 << 2) 325 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_96 (0x3 << 2) 326 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_4 0x0 327 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_8 0x1 328 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_16 0x2 329 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_32 0x3 330 331 #define TRF7970A_NFC_LOW_FIELD_LEVEL_RFDET(v) ((v) & 0x07) 332 #define TRF7970A_NFC_LOW_FIELD_LEVEL_CLEX_DIS BIT(7) 333 334 #define TRF7970A_NFC_TARGET_LEVEL_RFDET(v) ((v) & 0x07) 335 #define TRF7970A_NFC_TARGET_LEVEL_HI_RF BIT(3) 336 #define TRF7970A_NFC_TARGET_LEVEL_SDD_EN BIT(5) 337 #define TRF7970A_NFC_TARGET_LEVEL_LD_S_4BYTES (0x0 << 6) 338 #define TRF7970A_NFC_TARGET_LEVEL_LD_S_7BYTES (0x1 << 6) 339 #define TRF7970A_NFC_TARGET_LEVEL_LD_S_10BYTES (0x2 << 6) 340 341 #define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106 BIT(0) 342 #define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_212 BIT(1) 343 #define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_424 (BIT(0) | BIT(1)) 344 #define TRF79070A_NFC_TARGET_PROTOCOL_PAS_14443B BIT(2) 345 #define TRF79070A_NFC_TARGET_PROTOCOL_PAS_106 BIT(3) 346 #define TRF79070A_NFC_TARGET_PROTOCOL_FELICA BIT(4) 347 #define TRF79070A_NFC_TARGET_PROTOCOL_RF_L BIT(6) 348 #define TRF79070A_NFC_TARGET_PROTOCOL_RF_H BIT(7) 349 350 #define TRF79070A_NFC_TARGET_PROTOCOL_106A \ 351 (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \ 352 TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \ 353 TRF79070A_NFC_TARGET_PROTOCOL_PAS_106 | \ 354 TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106) 355 356 #define TRF79070A_NFC_TARGET_PROTOCOL_106B \ 357 (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \ 358 TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \ 359 TRF79070A_NFC_TARGET_PROTOCOL_PAS_14443B | \ 360 TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106) 361 362 #define TRF79070A_NFC_TARGET_PROTOCOL_212F \ 363 (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \ 364 TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \ 365 TRF79070A_NFC_TARGET_PROTOCOL_FELICA | \ 366 TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_212) 367 368 #define TRF79070A_NFC_TARGET_PROTOCOL_424F \ 369 (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \ 370 TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \ 371 TRF79070A_NFC_TARGET_PROTOCOL_FELICA | \ 372 TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_424) 373 374 #define TRF7970A_FIFO_STATUS_OVERFLOW BIT(7) 375 376 /* NFC (ISO/IEC 14443A) Type 2 Tag commands */ 377 #define NFC_T2T_CMD_READ 0x30 378 379 /* ISO 15693 commands codes */ 380 #define ISO15693_CMD_INVENTORY 0x01 381 #define ISO15693_CMD_READ_SINGLE_BLOCK 0x20 382 #define ISO15693_CMD_WRITE_SINGLE_BLOCK 0x21 383 #define ISO15693_CMD_LOCK_BLOCK 0x22 384 #define ISO15693_CMD_READ_MULTIPLE_BLOCK 0x23 385 #define ISO15693_CMD_WRITE_MULTIPLE_BLOCK 0x24 386 #define ISO15693_CMD_SELECT 0x25 387 #define ISO15693_CMD_RESET_TO_READY 0x26 388 #define ISO15693_CMD_WRITE_AFI 0x27 389 #define ISO15693_CMD_LOCK_AFI 0x28 390 #define ISO15693_CMD_WRITE_DSFID 0x29 391 #define ISO15693_CMD_LOCK_DSFID 0x2a 392 #define ISO15693_CMD_GET_SYSTEM_INFO 0x2b 393 #define ISO15693_CMD_GET_MULTIPLE_BLOCK_SECURITY_STATUS 0x2c 394 395 /* ISO 15693 request and response flags */ 396 #define ISO15693_REQ_FLAG_SUB_CARRIER BIT(0) 397 #define ISO15693_REQ_FLAG_DATA_RATE BIT(1) 398 #define ISO15693_REQ_FLAG_INVENTORY BIT(2) 399 #define ISO15693_REQ_FLAG_PROTOCOL_EXT BIT(3) 400 #define ISO15693_REQ_FLAG_SELECT BIT(4) 401 #define ISO15693_REQ_FLAG_AFI BIT(4) 402 #define ISO15693_REQ_FLAG_ADDRESS BIT(5) 403 #define ISO15693_REQ_FLAG_NB_SLOTS BIT(5) 404 #define ISO15693_REQ_FLAG_OPTION BIT(6) 405 406 #define ISO15693_REQ_FLAG_SPEED_MASK \ 407 (ISO15693_REQ_FLAG_SUB_CARRIER | ISO15693_REQ_FLAG_DATA_RATE) 408 409 enum trf7970a_state { 410 TRF7970A_ST_PWR_OFF, 411 TRF7970A_ST_RF_OFF, 412 TRF7970A_ST_IDLE, 413 TRF7970A_ST_IDLE_RX_BLOCKED, 414 TRF7970A_ST_WAIT_FOR_TX_FIFO, 415 TRF7970A_ST_WAIT_FOR_RX_DATA, 416 TRF7970A_ST_WAIT_FOR_RX_DATA_CONT, 417 TRF7970A_ST_WAIT_TO_ISSUE_EOF, 418 TRF7970A_ST_LISTENING, 419 TRF7970A_ST_LISTENING_MD, 420 TRF7970A_ST_MAX 421 }; 422 423 struct trf7970a { 424 enum trf7970a_state state; 425 struct device *dev; 426 struct spi_device *spi; 427 struct regulator *regulator; 428 struct nfc_digital_dev *ddev; 429 u32 quirks; 430 bool is_initiator; 431 bool aborting; 432 struct sk_buff *tx_skb; 433 struct sk_buff *rx_skb; 434 nfc_digital_cmd_complete_t cb; 435 void *cb_arg; 436 u8 chip_status_ctrl; 437 u8 iso_ctrl; 438 u8 iso_ctrl_tech; 439 u8 modulator_sys_clk_ctrl; 440 u8 special_fcn_reg1; 441 u8 io_ctrl; 442 unsigned int guard_time; 443 int technology; 444 int framing; 445 u8 md_rf_tech; 446 u8 tx_cmd; 447 bool issue_eof; 448 struct gpio_desc *en_gpiod; 449 struct gpio_desc *en2_gpiod; 450 struct mutex lock; 451 unsigned int timeout; 452 bool ignore_timeout; 453 struct delayed_work timeout_work; 454 }; 455 456 static int trf7970a_cmd(struct trf7970a *trf, u8 opcode) 457 { 458 u8 cmd = TRF7970A_CMD_BIT_CTRL | TRF7970A_CMD_BIT_OPCODE(opcode); 459 int ret; 460 461 dev_dbg(trf->dev, "cmd: 0x%x\n", cmd); 462 463 ret = spi_write(trf->spi, &cmd, 1); 464 if (ret) 465 dev_err(trf->dev, "%s - cmd: 0x%x, ret: %d\n", __func__, cmd, 466 ret); 467 return ret; 468 } 469 470 static int trf7970a_read(struct trf7970a *trf, u8 reg, u8 *val) 471 { 472 u8 addr = TRF7970A_CMD_BIT_RW | reg; 473 int ret; 474 475 ret = spi_write_then_read(trf->spi, &addr, 1, val, 1); 476 if (ret) 477 dev_err(trf->dev, "%s - addr: 0x%x, ret: %d\n", __func__, addr, 478 ret); 479 480 dev_dbg(trf->dev, "read(0x%x): 0x%x\n", addr, *val); 481 482 return ret; 483 } 484 485 static int trf7970a_read_cont(struct trf7970a *trf, u8 reg, u8 *buf, 486 size_t len) 487 { 488 u8 addr = reg | TRF7970A_CMD_BIT_RW | TRF7970A_CMD_BIT_CONTINUOUS; 489 struct spi_transfer t[2]; 490 struct spi_message m; 491 int ret; 492 493 dev_dbg(trf->dev, "read_cont(0x%x, %zd)\n", addr, len); 494 495 spi_message_init(&m); 496 497 memset(&t, 0, sizeof(t)); 498 499 t[0].tx_buf = &addr; 500 t[0].len = sizeof(addr); 501 spi_message_add_tail(&t[0], &m); 502 503 t[1].rx_buf = buf; 504 t[1].len = len; 505 spi_message_add_tail(&t[1], &m); 506 507 ret = spi_sync(trf->spi, &m); 508 if (ret) 509 dev_err(trf->dev, "%s - addr: 0x%x, ret: %d\n", __func__, addr, 510 ret); 511 return ret; 512 } 513 514 static int trf7970a_write(struct trf7970a *trf, u8 reg, u8 val) 515 { 516 u8 buf[2] = { reg, val }; 517 int ret; 518 519 dev_dbg(trf->dev, "write(0x%x): 0x%x\n", reg, val); 520 521 ret = spi_write(trf->spi, buf, 2); 522 if (ret) 523 dev_err(trf->dev, "%s - write: 0x%x 0x%x, ret: %d\n", __func__, 524 buf[0], buf[1], ret); 525 526 return ret; 527 } 528 529 static int trf7970a_read_irqstatus(struct trf7970a *trf, u8 *status) 530 { 531 int ret; 532 u8 buf[2]; 533 u8 addr; 534 535 addr = TRF7970A_IRQ_STATUS | TRF7970A_CMD_BIT_RW; 536 537 if (trf->quirks & TRF7970A_QUIRK_IRQ_STATUS_READ) { 538 addr |= TRF7970A_CMD_BIT_CONTINUOUS; 539 ret = spi_write_then_read(trf->spi, &addr, 1, buf, 2); 540 } else { 541 ret = spi_write_then_read(trf->spi, &addr, 1, buf, 1); 542 } 543 544 if (ret) 545 dev_err(trf->dev, "%s - irqstatus: Status read failed: %d\n", 546 __func__, ret); 547 else 548 *status = buf[0]; 549 550 return ret; 551 } 552 553 static int trf7970a_read_target_proto(struct trf7970a *trf, u8 *target_proto) 554 { 555 int ret; 556 u8 buf[2]; 557 u8 addr; 558 559 addr = TRF79070A_NFC_TARGET_PROTOCOL | TRF7970A_CMD_BIT_RW | 560 TRF7970A_CMD_BIT_CONTINUOUS; 561 562 ret = spi_write_then_read(trf->spi, &addr, 1, buf, 2); 563 if (ret) 564 dev_err(trf->dev, "%s - target_proto: Read failed: %d\n", 565 __func__, ret); 566 else 567 *target_proto = buf[0]; 568 569 return ret; 570 } 571 572 static int trf7970a_mode_detect(struct trf7970a *trf, u8 *rf_tech) 573 { 574 int ret; 575 u8 target_proto, tech; 576 577 ret = trf7970a_read_target_proto(trf, &target_proto); 578 if (ret) 579 return ret; 580 581 switch (target_proto) { 582 case TRF79070A_NFC_TARGET_PROTOCOL_106A: 583 tech = NFC_DIGITAL_RF_TECH_106A; 584 break; 585 case TRF79070A_NFC_TARGET_PROTOCOL_106B: 586 tech = NFC_DIGITAL_RF_TECH_106B; 587 break; 588 case TRF79070A_NFC_TARGET_PROTOCOL_212F: 589 tech = NFC_DIGITAL_RF_TECH_212F; 590 break; 591 case TRF79070A_NFC_TARGET_PROTOCOL_424F: 592 tech = NFC_DIGITAL_RF_TECH_424F; 593 break; 594 default: 595 dev_dbg(trf->dev, "%s - mode_detect: target_proto: 0x%x\n", 596 __func__, target_proto); 597 return -EIO; 598 } 599 600 *rf_tech = tech; 601 602 return ret; 603 } 604 605 static void trf7970a_send_upstream(struct trf7970a *trf) 606 { 607 dev_kfree_skb_any(trf->tx_skb); 608 trf->tx_skb = NULL; 609 610 if (trf->rx_skb && !IS_ERR(trf->rx_skb) && !trf->aborting) 611 print_hex_dump_debug("trf7970a rx data: ", DUMP_PREFIX_NONE, 612 16, 1, trf->rx_skb->data, trf->rx_skb->len, 613 false); 614 615 trf->state = TRF7970A_ST_IDLE; 616 617 if (trf->aborting) { 618 dev_dbg(trf->dev, "Abort process complete\n"); 619 620 if (!IS_ERR(trf->rx_skb)) { 621 kfree_skb(trf->rx_skb); 622 trf->rx_skb = ERR_PTR(-ECANCELED); 623 } 624 625 trf->aborting = false; 626 } 627 628 trf->cb(trf->ddev, trf->cb_arg, trf->rx_skb); 629 630 trf->rx_skb = NULL; 631 } 632 633 static void trf7970a_send_err_upstream(struct trf7970a *trf, int errno) 634 { 635 dev_dbg(trf->dev, "Error - state: %d, errno: %d\n", trf->state, errno); 636 637 cancel_delayed_work(&trf->timeout_work); 638 639 kfree_skb(trf->rx_skb); 640 trf->rx_skb = ERR_PTR(errno); 641 642 trf7970a_send_upstream(trf); 643 } 644 645 static int trf7970a_transmit(struct trf7970a *trf, struct sk_buff *skb, 646 unsigned int len, const u8 *prefix, 647 unsigned int prefix_len) 648 { 649 struct spi_transfer t[2]; 650 struct spi_message m; 651 unsigned int timeout; 652 int ret; 653 654 print_hex_dump_debug("trf7970a tx data: ", DUMP_PREFIX_NONE, 655 16, 1, skb->data, len, false); 656 657 spi_message_init(&m); 658 659 memset(&t, 0, sizeof(t)); 660 661 t[0].tx_buf = prefix; 662 t[0].len = prefix_len; 663 spi_message_add_tail(&t[0], &m); 664 665 t[1].tx_buf = skb->data; 666 t[1].len = len; 667 spi_message_add_tail(&t[1], &m); 668 669 ret = spi_sync(trf->spi, &m); 670 if (ret) { 671 dev_err(trf->dev, "%s - Can't send tx data: %d\n", __func__, 672 ret); 673 return ret; 674 } 675 676 skb_pull(skb, len); 677 678 if (skb->len > 0) { 679 trf->state = TRF7970A_ST_WAIT_FOR_TX_FIFO; 680 timeout = TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT; 681 } else { 682 if (trf->issue_eof) { 683 trf->state = TRF7970A_ST_WAIT_TO_ISSUE_EOF; 684 timeout = TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF; 685 } else { 686 trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA; 687 688 if (!trf->timeout) 689 timeout = TRF7970A_WAIT_FOR_TX_IRQ; 690 else 691 timeout = trf->timeout; 692 } 693 } 694 695 dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n", timeout, 696 trf->state); 697 698 schedule_delayed_work(&trf->timeout_work, msecs_to_jiffies(timeout)); 699 700 return 0; 701 } 702 703 static void trf7970a_fill_fifo(struct trf7970a *trf) 704 { 705 struct sk_buff *skb = trf->tx_skb; 706 unsigned int len; 707 int ret; 708 u8 fifo_bytes; 709 u8 prefix; 710 711 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes); 712 if (ret) { 713 trf7970a_send_err_upstream(trf, ret); 714 return; 715 } 716 717 dev_dbg(trf->dev, "Filling FIFO - fifo_bytes: 0x%x\n", fifo_bytes); 718 719 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; 720 721 /* Calculate how much more data can be written to the fifo */ 722 len = TRF7970A_FIFO_SIZE - fifo_bytes; 723 if (!len) { 724 schedule_delayed_work(&trf->timeout_work, 725 msecs_to_jiffies(TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT)); 726 return; 727 } 728 729 len = min(skb->len, len); 730 731 prefix = TRF7970A_CMD_BIT_CONTINUOUS | TRF7970A_FIFO_IO_REGISTER; 732 733 ret = trf7970a_transmit(trf, skb, len, &prefix, sizeof(prefix)); 734 if (ret) 735 trf7970a_send_err_upstream(trf, ret); 736 } 737 738 static void trf7970a_drain_fifo(struct trf7970a *trf, u8 status) 739 { 740 struct sk_buff *skb = trf->rx_skb; 741 int ret; 742 u8 fifo_bytes; 743 744 if (status & TRF7970A_IRQ_STATUS_ERROR) { 745 trf7970a_send_err_upstream(trf, -EIO); 746 return; 747 } 748 749 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes); 750 if (ret) { 751 trf7970a_send_err_upstream(trf, ret); 752 return; 753 } 754 755 dev_dbg(trf->dev, "Draining FIFO - fifo_bytes: 0x%x\n", fifo_bytes); 756 757 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; 758 759 if (!fifo_bytes) 760 goto no_rx_data; 761 762 if (fifo_bytes > skb_tailroom(skb)) { 763 skb = skb_copy_expand(skb, skb_headroom(skb), 764 max_t(int, fifo_bytes, 765 TRF7970A_RX_SKB_ALLOC_SIZE), 766 GFP_KERNEL); 767 if (!skb) { 768 trf7970a_send_err_upstream(trf, -ENOMEM); 769 return; 770 } 771 772 kfree_skb(trf->rx_skb); 773 trf->rx_skb = skb; 774 } 775 776 ret = trf7970a_read_cont(trf, TRF7970A_FIFO_IO_REGISTER, 777 skb_put(skb, fifo_bytes), fifo_bytes); 778 if (ret) { 779 trf7970a_send_err_upstream(trf, ret); 780 return; 781 } 782 783 /* If received Type 2 ACK/NACK, shift right 4 bits and pass up */ 784 if ((trf->framing == NFC_DIGITAL_FRAMING_NFCA_T2T) && (skb->len == 1) && 785 (trf->special_fcn_reg1 == TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX)) { 786 skb->data[0] >>= 4; 787 status = TRF7970A_IRQ_STATUS_SRX; 788 } else { 789 trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA_CONT; 790 791 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes); 792 if (ret) { 793 trf7970a_send_err_upstream(trf, ret); 794 return; 795 } 796 797 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; 798 799 /* If there are bytes in the FIFO, set status to '0' so 800 * the if stmt below doesn't fire and the driver will wait 801 * for the trf7970a to generate another RX interrupt. 802 */ 803 if (fifo_bytes) 804 status = 0; 805 } 806 807 no_rx_data: 808 if (status == TRF7970A_IRQ_STATUS_SRX) { /* Receive complete */ 809 trf7970a_send_upstream(trf); 810 return; 811 } 812 813 dev_dbg(trf->dev, "Setting timeout for %d ms\n", 814 TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT); 815 816 schedule_delayed_work(&trf->timeout_work, 817 msecs_to_jiffies(TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT)); 818 } 819 820 static irqreturn_t trf7970a_irq(int irq, void *dev_id) 821 { 822 struct trf7970a *trf = dev_id; 823 int ret; 824 u8 status, fifo_bytes, iso_ctrl; 825 826 mutex_lock(&trf->lock); 827 828 if (trf->state == TRF7970A_ST_RF_OFF) { 829 mutex_unlock(&trf->lock); 830 return IRQ_NONE; 831 } 832 833 ret = trf7970a_read_irqstatus(trf, &status); 834 if (ret) { 835 mutex_unlock(&trf->lock); 836 return IRQ_NONE; 837 } 838 839 dev_dbg(trf->dev, "IRQ - state: %d, status: 0x%x\n", trf->state, 840 status); 841 842 if (!status) { 843 mutex_unlock(&trf->lock); 844 return IRQ_NONE; 845 } 846 847 switch (trf->state) { 848 case TRF7970A_ST_IDLE: 849 case TRF7970A_ST_IDLE_RX_BLOCKED: 850 /* If initiator and getting interrupts caused by RF noise, 851 * turn off the receiver to avoid unnecessary interrupts. 852 * It will be turned back on in trf7970a_send_cmd() when 853 * the next command is issued. 854 */ 855 if (trf->is_initiator && (status & TRF7970A_IRQ_STATUS_ERROR)) { 856 trf7970a_cmd(trf, TRF7970A_CMD_BLOCK_RX); 857 trf->state = TRF7970A_ST_IDLE_RX_BLOCKED; 858 } 859 860 trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); 861 break; 862 case TRF7970A_ST_WAIT_FOR_TX_FIFO: 863 if (status & TRF7970A_IRQ_STATUS_TX) { 864 trf->ignore_timeout = 865 !cancel_delayed_work(&trf->timeout_work); 866 trf7970a_fill_fifo(trf); 867 } else { 868 trf7970a_send_err_upstream(trf, -EIO); 869 } 870 break; 871 case TRF7970A_ST_WAIT_FOR_RX_DATA: 872 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: 873 if (status & TRF7970A_IRQ_STATUS_SRX) { 874 trf->ignore_timeout = 875 !cancel_delayed_work(&trf->timeout_work); 876 trf7970a_drain_fifo(trf, status); 877 } else if (status & TRF7970A_IRQ_STATUS_FIFO) { 878 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, 879 &fifo_bytes); 880 881 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; 882 883 if (ret) 884 trf7970a_send_err_upstream(trf, ret); 885 else if (!fifo_bytes) 886 trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); 887 } else if ((status == TRF7970A_IRQ_STATUS_TX) || 888 (!trf->is_initiator && 889 (status == (TRF7970A_IRQ_STATUS_TX | 890 TRF7970A_IRQ_STATUS_NFC_RF)))) { 891 trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); 892 893 if (!trf->timeout) { 894 trf->ignore_timeout = 895 !cancel_delayed_work(&trf->timeout_work); 896 trf->rx_skb = ERR_PTR(0); 897 trf7970a_send_upstream(trf); 898 break; 899 } 900 901 if (trf->is_initiator) 902 break; 903 904 iso_ctrl = trf->iso_ctrl; 905 906 switch (trf->framing) { 907 case NFC_DIGITAL_FRAMING_NFCA_STANDARD: 908 trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC; 909 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; 910 trf->iso_ctrl = 0xff; /* Force ISO_CTRL write */ 911 break; 912 case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A: 913 trf->tx_cmd = TRF7970A_CMD_TRANSMIT; 914 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; 915 trf->iso_ctrl = 0xff; /* Force ISO_CTRL write */ 916 break; 917 case NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE: 918 ret = trf7970a_write(trf, 919 TRF7970A_SPECIAL_FCN_REG1, 920 TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL); 921 if (ret) 922 goto err_unlock_exit; 923 924 trf->special_fcn_reg1 = 925 TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL; 926 break; 927 default: 928 break; 929 } 930 931 if (iso_ctrl != trf->iso_ctrl) { 932 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, 933 iso_ctrl); 934 if (ret) 935 goto err_unlock_exit; 936 937 trf->iso_ctrl = iso_ctrl; 938 } 939 } else { 940 trf7970a_send_err_upstream(trf, -EIO); 941 } 942 break; 943 case TRF7970A_ST_WAIT_TO_ISSUE_EOF: 944 if (status != TRF7970A_IRQ_STATUS_TX) 945 trf7970a_send_err_upstream(trf, -EIO); 946 break; 947 case TRF7970A_ST_LISTENING: 948 if (status & TRF7970A_IRQ_STATUS_SRX) { 949 trf->ignore_timeout = 950 !cancel_delayed_work(&trf->timeout_work); 951 trf7970a_drain_fifo(trf, status); 952 } else if (!(status & TRF7970A_IRQ_STATUS_NFC_RF)) { 953 trf7970a_send_err_upstream(trf, -EIO); 954 } 955 break; 956 case TRF7970A_ST_LISTENING_MD: 957 if (status & TRF7970A_IRQ_STATUS_SRX) { 958 trf->ignore_timeout = 959 !cancel_delayed_work(&trf->timeout_work); 960 961 ret = trf7970a_mode_detect(trf, &trf->md_rf_tech); 962 if (ret) { 963 trf7970a_send_err_upstream(trf, ret); 964 } else { 965 trf->state = TRF7970A_ST_LISTENING; 966 trf7970a_drain_fifo(trf, status); 967 } 968 } else if (!(status & TRF7970A_IRQ_STATUS_NFC_RF)) { 969 trf7970a_send_err_upstream(trf, -EIO); 970 } 971 break; 972 default: 973 dev_err(trf->dev, "%s - Driver in invalid state: %d\n", 974 __func__, trf->state); 975 } 976 977 err_unlock_exit: 978 mutex_unlock(&trf->lock); 979 return IRQ_HANDLED; 980 } 981 982 static void trf7970a_issue_eof(struct trf7970a *trf) 983 { 984 int ret; 985 986 dev_dbg(trf->dev, "Issuing EOF\n"); 987 988 ret = trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); 989 if (ret) 990 trf7970a_send_err_upstream(trf, ret); 991 992 ret = trf7970a_cmd(trf, TRF7970A_CMD_EOF); 993 if (ret) 994 trf7970a_send_err_upstream(trf, ret); 995 996 trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA; 997 998 dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n", 999 trf->timeout, trf->state); 1000 1001 schedule_delayed_work(&trf->timeout_work, 1002 msecs_to_jiffies(trf->timeout)); 1003 } 1004 1005 static void trf7970a_timeout_work_handler(struct work_struct *work) 1006 { 1007 struct trf7970a *trf = container_of(work, struct trf7970a, 1008 timeout_work.work); 1009 1010 dev_dbg(trf->dev, "Timeout - state: %d, ignore_timeout: %d\n", 1011 trf->state, trf->ignore_timeout); 1012 1013 mutex_lock(&trf->lock); 1014 1015 if (trf->ignore_timeout) 1016 trf->ignore_timeout = false; 1017 else if (trf->state == TRF7970A_ST_WAIT_FOR_RX_DATA_CONT) 1018 trf7970a_drain_fifo(trf, TRF7970A_IRQ_STATUS_SRX); 1019 else if (trf->state == TRF7970A_ST_WAIT_TO_ISSUE_EOF) 1020 trf7970a_issue_eof(trf); 1021 else 1022 trf7970a_send_err_upstream(trf, -ETIMEDOUT); 1023 1024 mutex_unlock(&trf->lock); 1025 } 1026 1027 static int trf7970a_init(struct trf7970a *trf) 1028 { 1029 int ret; 1030 1031 dev_dbg(trf->dev, "Initializing device - state: %d\n", trf->state); 1032 1033 ret = trf7970a_cmd(trf, TRF7970A_CMD_SOFT_INIT); 1034 if (ret) 1035 goto err_out; 1036 1037 ret = trf7970a_cmd(trf, TRF7970A_CMD_IDLE); 1038 if (ret) 1039 goto err_out; 1040 1041 ret = trf7970a_write(trf, TRF7970A_REG_IO_CTRL, 1042 trf->io_ctrl | TRF7970A_REG_IO_CTRL_VRS(0x1)); 1043 if (ret) 1044 goto err_out; 1045 1046 ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0); 1047 if (ret) 1048 goto err_out; 1049 1050 usleep_range(1000, 2000); 1051 1052 trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON; 1053 1054 ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, 1055 trf->modulator_sys_clk_ctrl); 1056 if (ret) 1057 goto err_out; 1058 1059 ret = trf7970a_write(trf, TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS, 1060 TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_96 | 1061 TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_32); 1062 if (ret) 1063 goto err_out; 1064 1065 ret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1, 0); 1066 if (ret) 1067 goto err_out; 1068 1069 trf->special_fcn_reg1 = 0; 1070 1071 trf->iso_ctrl = 0xff; 1072 return 0; 1073 1074 err_out: 1075 dev_dbg(trf->dev, "Couldn't init device: %d\n", ret); 1076 return ret; 1077 } 1078 1079 static void trf7970a_switch_rf_off(struct trf7970a *trf) 1080 { 1081 if ((trf->state == TRF7970A_ST_PWR_OFF) || 1082 (trf->state == TRF7970A_ST_RF_OFF)) 1083 return; 1084 1085 dev_dbg(trf->dev, "Switching rf off\n"); 1086 1087 trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON; 1088 1089 trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, trf->chip_status_ctrl); 1090 1091 trf->aborting = false; 1092 trf->state = TRF7970A_ST_RF_OFF; 1093 1094 pm_runtime_mark_last_busy(trf->dev); 1095 pm_runtime_put_autosuspend(trf->dev); 1096 } 1097 1098 static int trf7970a_switch_rf_on(struct trf7970a *trf) 1099 { 1100 int ret; 1101 1102 dev_dbg(trf->dev, "Switching rf on\n"); 1103 1104 pm_runtime_get_sync(trf->dev); 1105 1106 if (trf->state != TRF7970A_ST_RF_OFF) { /* Power on, RF off */ 1107 dev_err(trf->dev, "%s - Incorrect state: %d\n", __func__, 1108 trf->state); 1109 return -EINVAL; 1110 } 1111 1112 ret = trf7970a_init(trf); 1113 if (ret) { 1114 dev_err(trf->dev, "%s - Can't initialize: %d\n", __func__, ret); 1115 return ret; 1116 } 1117 1118 trf->state = TRF7970A_ST_IDLE; 1119 1120 return 0; 1121 } 1122 1123 static int trf7970a_switch_rf(struct nfc_digital_dev *ddev, bool on) 1124 { 1125 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1126 int ret = 0; 1127 1128 dev_dbg(trf->dev, "Switching RF - state: %d, on: %d\n", trf->state, on); 1129 1130 mutex_lock(&trf->lock); 1131 1132 if (on) { 1133 switch (trf->state) { 1134 case TRF7970A_ST_PWR_OFF: 1135 case TRF7970A_ST_RF_OFF: 1136 ret = trf7970a_switch_rf_on(trf); 1137 break; 1138 case TRF7970A_ST_IDLE: 1139 case TRF7970A_ST_IDLE_RX_BLOCKED: 1140 break; 1141 default: 1142 dev_err(trf->dev, "%s - Invalid request: %d %d\n", 1143 __func__, trf->state, on); 1144 trf7970a_switch_rf_off(trf); 1145 ret = -EINVAL; 1146 } 1147 } else { 1148 switch (trf->state) { 1149 case TRF7970A_ST_PWR_OFF: 1150 case TRF7970A_ST_RF_OFF: 1151 break; 1152 default: 1153 dev_err(trf->dev, "%s - Invalid request: %d %d\n", 1154 __func__, trf->state, on); 1155 ret = -EINVAL; 1156 fallthrough; 1157 case TRF7970A_ST_IDLE: 1158 case TRF7970A_ST_IDLE_RX_BLOCKED: 1159 case TRF7970A_ST_WAIT_FOR_RX_DATA: 1160 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: 1161 trf7970a_switch_rf_off(trf); 1162 } 1163 } 1164 1165 mutex_unlock(&trf->lock); 1166 return ret; 1167 } 1168 1169 static int trf7970a_in_config_rf_tech(struct trf7970a *trf, int tech) 1170 { 1171 int ret = 0; 1172 1173 dev_dbg(trf->dev, "rf technology: %d\n", tech); 1174 1175 switch (tech) { 1176 case NFC_DIGITAL_RF_TECH_106A: 1177 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443A_106; 1178 trf->modulator_sys_clk_ctrl = 1179 (trf->modulator_sys_clk_ctrl & 0xf8) | 1180 TRF7970A_MODULATOR_DEPTH_OOK; 1181 trf->guard_time = TRF7970A_GUARD_TIME_NFCA; 1182 break; 1183 case NFC_DIGITAL_RF_TECH_106B: 1184 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443B_106; 1185 trf->modulator_sys_clk_ctrl = 1186 (trf->modulator_sys_clk_ctrl & 0xf8) | 1187 TRF7970A_MODULATOR_DEPTH_ASK10; 1188 trf->guard_time = TRF7970A_GUARD_TIME_NFCB; 1189 break; 1190 case NFC_DIGITAL_RF_TECH_212F: 1191 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_212; 1192 trf->modulator_sys_clk_ctrl = 1193 (trf->modulator_sys_clk_ctrl & 0xf8) | 1194 TRF7970A_MODULATOR_DEPTH_ASK10; 1195 trf->guard_time = TRF7970A_GUARD_TIME_NFCF; 1196 break; 1197 case NFC_DIGITAL_RF_TECH_424F: 1198 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_424; 1199 trf->modulator_sys_clk_ctrl = 1200 (trf->modulator_sys_clk_ctrl & 0xf8) | 1201 TRF7970A_MODULATOR_DEPTH_ASK10; 1202 trf->guard_time = TRF7970A_GUARD_TIME_NFCF; 1203 break; 1204 case NFC_DIGITAL_RF_TECH_ISO15693: 1205 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648; 1206 trf->modulator_sys_clk_ctrl = 1207 (trf->modulator_sys_clk_ctrl & 0xf8) | 1208 TRF7970A_MODULATOR_DEPTH_OOK; 1209 trf->guard_time = TRF7970A_GUARD_TIME_15693; 1210 break; 1211 default: 1212 dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech); 1213 return -EINVAL; 1214 } 1215 1216 trf->technology = tech; 1217 1218 /* If in initiator mode and not changing the RF tech due to a 1219 * PSL sequence (indicated by 'trf->iso_ctrl == 0xff' from 1220 * trf7970a_init()), clear the NFC Target Detection Level register 1221 * due to erratum. 1222 */ 1223 if (trf->iso_ctrl == 0xff) 1224 ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0); 1225 1226 return ret; 1227 } 1228 1229 static int trf7970a_is_rf_field(struct trf7970a *trf, bool *is_rf_field) 1230 { 1231 int ret; 1232 u8 rssi; 1233 1234 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, 1235 trf->chip_status_ctrl | 1236 TRF7970A_CHIP_STATUS_REC_ON); 1237 if (ret) 1238 return ret; 1239 1240 ret = trf7970a_cmd(trf, TRF7970A_CMD_TEST_EXT_RF); 1241 if (ret) 1242 return ret; 1243 1244 usleep_range(50, 60); 1245 1246 ret = trf7970a_read(trf, TRF7970A_RSSI_OSC_STATUS, &rssi); 1247 if (ret) 1248 return ret; 1249 1250 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, 1251 trf->chip_status_ctrl); 1252 if (ret) 1253 return ret; 1254 1255 if (rssi & TRF7970A_RSSI_OSC_STATUS_RSSI_MASK) 1256 *is_rf_field = true; 1257 else 1258 *is_rf_field = false; 1259 1260 return 0; 1261 } 1262 1263 static int trf7970a_in_config_framing(struct trf7970a *trf, int framing) 1264 { 1265 u8 iso_ctrl = trf->iso_ctrl_tech; 1266 bool is_rf_field = false; 1267 int ret; 1268 1269 dev_dbg(trf->dev, "framing: %d\n", framing); 1270 1271 switch (framing) { 1272 case NFC_DIGITAL_FRAMING_NFCA_SHORT: 1273 case NFC_DIGITAL_FRAMING_NFCA_STANDARD: 1274 trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC; 1275 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; 1276 break; 1277 case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A: 1278 case NFC_DIGITAL_FRAMING_NFCA_T4T: 1279 case NFC_DIGITAL_FRAMING_NFCB: 1280 case NFC_DIGITAL_FRAMING_NFCB_T4T: 1281 case NFC_DIGITAL_FRAMING_NFCF: 1282 case NFC_DIGITAL_FRAMING_NFCF_T3T: 1283 case NFC_DIGITAL_FRAMING_ISO15693_INVENTORY: 1284 case NFC_DIGITAL_FRAMING_ISO15693_T5T: 1285 case NFC_DIGITAL_FRAMING_NFCA_NFC_DEP: 1286 case NFC_DIGITAL_FRAMING_NFCF_NFC_DEP: 1287 trf->tx_cmd = TRF7970A_CMD_TRANSMIT; 1288 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; 1289 break; 1290 case NFC_DIGITAL_FRAMING_NFCA_T2T: 1291 trf->tx_cmd = TRF7970A_CMD_TRANSMIT; 1292 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; 1293 break; 1294 default: 1295 dev_dbg(trf->dev, "Unsupported Framing: %d\n", framing); 1296 return -EINVAL; 1297 } 1298 1299 trf->framing = framing; 1300 1301 if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) { 1302 ret = trf7970a_is_rf_field(trf, &is_rf_field); 1303 if (ret) 1304 return ret; 1305 1306 if (is_rf_field) 1307 return -EBUSY; 1308 } 1309 1310 if (iso_ctrl != trf->iso_ctrl) { 1311 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl); 1312 if (ret) 1313 return ret; 1314 1315 trf->iso_ctrl = iso_ctrl; 1316 1317 ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, 1318 trf->modulator_sys_clk_ctrl); 1319 if (ret) 1320 return ret; 1321 } 1322 1323 if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) { 1324 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, 1325 trf->chip_status_ctrl | 1326 TRF7970A_CHIP_STATUS_RF_ON); 1327 if (ret) 1328 return ret; 1329 1330 trf->chip_status_ctrl |= TRF7970A_CHIP_STATUS_RF_ON; 1331 1332 usleep_range(trf->guard_time, trf->guard_time + 1000); 1333 } 1334 1335 return 0; 1336 } 1337 1338 static int trf7970a_in_configure_hw(struct nfc_digital_dev *ddev, int type, 1339 int param) 1340 { 1341 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1342 int ret; 1343 1344 dev_dbg(trf->dev, "Configure hw - type: %d, param: %d\n", type, param); 1345 1346 mutex_lock(&trf->lock); 1347 1348 trf->is_initiator = true; 1349 1350 if ((trf->state == TRF7970A_ST_PWR_OFF) || 1351 (trf->state == TRF7970A_ST_RF_OFF)) { 1352 ret = trf7970a_switch_rf_on(trf); 1353 if (ret) 1354 goto err_unlock; 1355 } 1356 1357 switch (type) { 1358 case NFC_DIGITAL_CONFIG_RF_TECH: 1359 ret = trf7970a_in_config_rf_tech(trf, param); 1360 break; 1361 case NFC_DIGITAL_CONFIG_FRAMING: 1362 ret = trf7970a_in_config_framing(trf, param); 1363 break; 1364 default: 1365 dev_dbg(trf->dev, "Unknown type: %d\n", type); 1366 ret = -EINVAL; 1367 } 1368 1369 err_unlock: 1370 mutex_unlock(&trf->lock); 1371 return ret; 1372 } 1373 1374 static int trf7970a_is_iso15693_write_or_lock(u8 cmd) 1375 { 1376 switch (cmd) { 1377 case ISO15693_CMD_WRITE_SINGLE_BLOCK: 1378 case ISO15693_CMD_LOCK_BLOCK: 1379 case ISO15693_CMD_WRITE_MULTIPLE_BLOCK: 1380 case ISO15693_CMD_WRITE_AFI: 1381 case ISO15693_CMD_LOCK_AFI: 1382 case ISO15693_CMD_WRITE_DSFID: 1383 case ISO15693_CMD_LOCK_DSFID: 1384 return 1; 1385 default: 1386 return 0; 1387 } 1388 } 1389 1390 static int trf7970a_per_cmd_config(struct trf7970a *trf, 1391 const struct sk_buff *skb) 1392 { 1393 const u8 *req = skb->data; 1394 u8 special_fcn_reg1, iso_ctrl; 1395 int ret; 1396 1397 trf->issue_eof = false; 1398 1399 /* When issuing Type 2 read command, make sure the '4_bit_RX' bit in 1400 * special functions register 1 is cleared; otherwise, its a write or 1401 * sector select command and '4_bit_RX' must be set. 1402 * 1403 * When issuing an ISO 15693 command, inspect the flags byte to see 1404 * what speed to use. Also, remember if the OPTION flag is set on 1405 * a Type 5 write or lock command so the driver will know that it 1406 * has to send an EOF in order to get a response. 1407 */ 1408 if ((trf->technology == NFC_DIGITAL_RF_TECH_106A) && 1409 (trf->framing == NFC_DIGITAL_FRAMING_NFCA_T2T)) { 1410 if (req[0] == NFC_T2T_CMD_READ) 1411 special_fcn_reg1 = 0; 1412 else 1413 special_fcn_reg1 = TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX; 1414 1415 if (special_fcn_reg1 != trf->special_fcn_reg1) { 1416 ret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1, 1417 special_fcn_reg1); 1418 if (ret) 1419 return ret; 1420 1421 trf->special_fcn_reg1 = special_fcn_reg1; 1422 } 1423 } else if (trf->technology == NFC_DIGITAL_RF_TECH_ISO15693) { 1424 iso_ctrl = trf->iso_ctrl & ~TRF7970A_ISO_CTRL_RFID_SPEED_MASK; 1425 1426 switch (req[0] & ISO15693_REQ_FLAG_SPEED_MASK) { 1427 case 0x00: 1428 iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_662; 1429 break; 1430 case ISO15693_REQ_FLAG_SUB_CARRIER: 1431 iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_667a; 1432 break; 1433 case ISO15693_REQ_FLAG_DATA_RATE: 1434 iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648; 1435 break; 1436 case (ISO15693_REQ_FLAG_SUB_CARRIER | 1437 ISO15693_REQ_FLAG_DATA_RATE): 1438 iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_2669; 1439 break; 1440 } 1441 1442 if (iso_ctrl != trf->iso_ctrl) { 1443 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl); 1444 if (ret) 1445 return ret; 1446 1447 trf->iso_ctrl = iso_ctrl; 1448 } 1449 1450 if ((trf->framing == NFC_DIGITAL_FRAMING_ISO15693_T5T) && 1451 trf7970a_is_iso15693_write_or_lock(req[1]) && 1452 (req[0] & ISO15693_REQ_FLAG_OPTION)) 1453 trf->issue_eof = true; 1454 } 1455 1456 return 0; 1457 } 1458 1459 static int trf7970a_send_cmd(struct nfc_digital_dev *ddev, 1460 struct sk_buff *skb, u16 timeout, 1461 nfc_digital_cmd_complete_t cb, void *arg) 1462 { 1463 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1464 u8 prefix[5]; 1465 unsigned int len; 1466 int ret; 1467 u8 status; 1468 1469 dev_dbg(trf->dev, "New request - state: %d, timeout: %d ms, len: %d\n", 1470 trf->state, timeout, skb->len); 1471 1472 if (skb->len > TRF7970A_TX_MAX) 1473 return -EINVAL; 1474 1475 mutex_lock(&trf->lock); 1476 1477 if ((trf->state != TRF7970A_ST_IDLE) && 1478 (trf->state != TRF7970A_ST_IDLE_RX_BLOCKED)) { 1479 dev_err(trf->dev, "%s - Bogus state: %d\n", __func__, 1480 trf->state); 1481 ret = -EIO; 1482 goto out_err; 1483 } 1484 1485 if (trf->aborting) { 1486 dev_dbg(trf->dev, "Abort process complete\n"); 1487 trf->aborting = false; 1488 ret = -ECANCELED; 1489 goto out_err; 1490 } 1491 1492 if (timeout) { 1493 trf->rx_skb = nfc_alloc_recv_skb(TRF7970A_RX_SKB_ALLOC_SIZE, 1494 GFP_KERNEL); 1495 if (!trf->rx_skb) { 1496 dev_dbg(trf->dev, "Can't alloc rx_skb\n"); 1497 ret = -ENOMEM; 1498 goto out_err; 1499 } 1500 } 1501 1502 if (trf->state == TRF7970A_ST_IDLE_RX_BLOCKED) { 1503 ret = trf7970a_cmd(trf, TRF7970A_CMD_ENABLE_RX); 1504 if (ret) 1505 goto out_err; 1506 1507 trf->state = TRF7970A_ST_IDLE; 1508 } 1509 1510 if (trf->is_initiator) { 1511 ret = trf7970a_per_cmd_config(trf, skb); 1512 if (ret) 1513 goto out_err; 1514 } 1515 1516 trf->ddev = ddev; 1517 trf->tx_skb = skb; 1518 trf->cb = cb; 1519 trf->cb_arg = arg; 1520 trf->timeout = timeout; 1521 trf->ignore_timeout = false; 1522 1523 len = skb->len; 1524 1525 /* TX data must be prefixed with a FIFO reset cmd, a cmd that depends 1526 * on what the current framing is, the address of the TX length byte 1 1527 * register (0x1d), and the 2 byte length of the data to be transmitted. 1528 * That totals 5 bytes. 1529 */ 1530 prefix[0] = TRF7970A_CMD_BIT_CTRL | 1531 TRF7970A_CMD_BIT_OPCODE(TRF7970A_CMD_FIFO_RESET); 1532 prefix[1] = TRF7970A_CMD_BIT_CTRL | 1533 TRF7970A_CMD_BIT_OPCODE(trf->tx_cmd); 1534 prefix[2] = TRF7970A_CMD_BIT_CONTINUOUS | TRF7970A_TX_LENGTH_BYTE1; 1535 1536 if (trf->framing == NFC_DIGITAL_FRAMING_NFCA_SHORT) { 1537 prefix[3] = 0x00; 1538 prefix[4] = 0x0f; /* 7 bits */ 1539 } else { 1540 prefix[3] = (len & 0xf00) >> 4; 1541 prefix[3] |= ((len & 0xf0) >> 4); 1542 prefix[4] = ((len & 0x0f) << 4); 1543 } 1544 1545 len = min_t(int, skb->len, TRF7970A_FIFO_SIZE); 1546 1547 /* Clear possible spurious interrupt */ 1548 ret = trf7970a_read_irqstatus(trf, &status); 1549 if (ret) 1550 goto out_err; 1551 1552 ret = trf7970a_transmit(trf, skb, len, prefix, sizeof(prefix)); 1553 if (ret) { 1554 kfree_skb(trf->rx_skb); 1555 trf->rx_skb = NULL; 1556 } 1557 1558 out_err: 1559 mutex_unlock(&trf->lock); 1560 return ret; 1561 } 1562 1563 static int trf7970a_tg_config_rf_tech(struct trf7970a *trf, int tech) 1564 { 1565 int ret = 0; 1566 1567 dev_dbg(trf->dev, "rf technology: %d\n", tech); 1568 1569 switch (tech) { 1570 case NFC_DIGITAL_RF_TECH_106A: 1571 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE | 1572 TRF7970A_ISO_CTRL_NFC_CE | TRF7970A_ISO_CTRL_NFC_CE_14443A; 1573 trf->modulator_sys_clk_ctrl = 1574 (trf->modulator_sys_clk_ctrl & 0xf8) | 1575 TRF7970A_MODULATOR_DEPTH_OOK; 1576 break; 1577 case NFC_DIGITAL_RF_TECH_212F: 1578 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE | 1579 TRF7970A_ISO_CTRL_NFC_NFCF_212; 1580 trf->modulator_sys_clk_ctrl = 1581 (trf->modulator_sys_clk_ctrl & 0xf8) | 1582 TRF7970A_MODULATOR_DEPTH_ASK10; 1583 break; 1584 case NFC_DIGITAL_RF_TECH_424F: 1585 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE | 1586 TRF7970A_ISO_CTRL_NFC_NFCF_424; 1587 trf->modulator_sys_clk_ctrl = 1588 (trf->modulator_sys_clk_ctrl & 0xf8) | 1589 TRF7970A_MODULATOR_DEPTH_ASK10; 1590 break; 1591 default: 1592 dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech); 1593 return -EINVAL; 1594 } 1595 1596 trf->technology = tech; 1597 1598 /* Normally we write the ISO_CTRL register in 1599 * trf7970a_tg_config_framing() because the framing can change 1600 * the value written. However, when sending a PSL RES, 1601 * digital_tg_send_psl_res_complete() doesn't call 1602 * trf7970a_tg_config_framing() so we must write the register 1603 * here. 1604 */ 1605 if ((trf->framing == NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED) && 1606 (trf->iso_ctrl_tech != trf->iso_ctrl)) { 1607 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, 1608 trf->iso_ctrl_tech); 1609 1610 trf->iso_ctrl = trf->iso_ctrl_tech; 1611 } 1612 1613 return ret; 1614 } 1615 1616 /* Since this is a target routine, several of the framing calls are 1617 * made between receiving the request and sending the response so they 1618 * should take effect until after the response is sent. This is accomplished 1619 * by skipping the ISO_CTRL register write here and doing it in the interrupt 1620 * handler. 1621 */ 1622 static int trf7970a_tg_config_framing(struct trf7970a *trf, int framing) 1623 { 1624 u8 iso_ctrl = trf->iso_ctrl_tech; 1625 int ret; 1626 1627 dev_dbg(trf->dev, "framing: %d\n", framing); 1628 1629 switch (framing) { 1630 case NFC_DIGITAL_FRAMING_NFCA_NFC_DEP: 1631 trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC; 1632 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; 1633 break; 1634 case NFC_DIGITAL_FRAMING_NFCA_STANDARD: 1635 case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A: 1636 case NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE: 1637 /* These ones are applied in the interrupt handler */ 1638 iso_ctrl = trf->iso_ctrl; /* Don't write to ISO_CTRL yet */ 1639 break; 1640 case NFC_DIGITAL_FRAMING_NFCF_NFC_DEP: 1641 trf->tx_cmd = TRF7970A_CMD_TRANSMIT; 1642 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; 1643 break; 1644 case NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED: 1645 trf->tx_cmd = TRF7970A_CMD_TRANSMIT; 1646 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; 1647 break; 1648 default: 1649 dev_dbg(trf->dev, "Unsupported Framing: %d\n", framing); 1650 return -EINVAL; 1651 } 1652 1653 trf->framing = framing; 1654 1655 if (iso_ctrl != trf->iso_ctrl) { 1656 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl); 1657 if (ret) 1658 return ret; 1659 1660 trf->iso_ctrl = iso_ctrl; 1661 1662 ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, 1663 trf->modulator_sys_clk_ctrl); 1664 if (ret) 1665 return ret; 1666 } 1667 1668 if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) { 1669 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, 1670 trf->chip_status_ctrl | 1671 TRF7970A_CHIP_STATUS_RF_ON); 1672 if (ret) 1673 return ret; 1674 1675 trf->chip_status_ctrl |= TRF7970A_CHIP_STATUS_RF_ON; 1676 } 1677 1678 return 0; 1679 } 1680 1681 static int trf7970a_tg_configure_hw(struct nfc_digital_dev *ddev, int type, 1682 int param) 1683 { 1684 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1685 int ret; 1686 1687 dev_dbg(trf->dev, "Configure hw - type: %d, param: %d\n", type, param); 1688 1689 mutex_lock(&trf->lock); 1690 1691 trf->is_initiator = false; 1692 1693 if ((trf->state == TRF7970A_ST_PWR_OFF) || 1694 (trf->state == TRF7970A_ST_RF_OFF)) { 1695 ret = trf7970a_switch_rf_on(trf); 1696 if (ret) 1697 goto err_unlock; 1698 } 1699 1700 switch (type) { 1701 case NFC_DIGITAL_CONFIG_RF_TECH: 1702 ret = trf7970a_tg_config_rf_tech(trf, param); 1703 break; 1704 case NFC_DIGITAL_CONFIG_FRAMING: 1705 ret = trf7970a_tg_config_framing(trf, param); 1706 break; 1707 default: 1708 dev_dbg(trf->dev, "Unknown type: %d\n", type); 1709 ret = -EINVAL; 1710 } 1711 1712 err_unlock: 1713 mutex_unlock(&trf->lock); 1714 return ret; 1715 } 1716 1717 static int _trf7970a_tg_listen(struct nfc_digital_dev *ddev, u16 timeout, 1718 nfc_digital_cmd_complete_t cb, void *arg, 1719 bool mode_detect) 1720 { 1721 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1722 int ret; 1723 1724 mutex_lock(&trf->lock); 1725 1726 if ((trf->state != TRF7970A_ST_IDLE) && 1727 (trf->state != TRF7970A_ST_IDLE_RX_BLOCKED)) { 1728 dev_err(trf->dev, "%s - Bogus state: %d\n", __func__, 1729 trf->state); 1730 ret = -EIO; 1731 goto out_err; 1732 } 1733 1734 if (trf->aborting) { 1735 dev_dbg(trf->dev, "Abort process complete\n"); 1736 trf->aborting = false; 1737 ret = -ECANCELED; 1738 goto out_err; 1739 } 1740 1741 trf->rx_skb = nfc_alloc_recv_skb(TRF7970A_RX_SKB_ALLOC_SIZE, 1742 GFP_KERNEL); 1743 if (!trf->rx_skb) { 1744 dev_dbg(trf->dev, "Can't alloc rx_skb\n"); 1745 ret = -ENOMEM; 1746 goto out_err; 1747 } 1748 1749 ret = trf7970a_write(trf, TRF7970A_RX_SPECIAL_SETTINGS, 1750 TRF7970A_RX_SPECIAL_SETTINGS_HBT | 1751 TRF7970A_RX_SPECIAL_SETTINGS_M848 | 1752 TRF7970A_RX_SPECIAL_SETTINGS_C424 | 1753 TRF7970A_RX_SPECIAL_SETTINGS_C212); 1754 if (ret) 1755 goto out_err; 1756 1757 ret = trf7970a_write(trf, TRF7970A_REG_IO_CTRL, 1758 trf->io_ctrl | TRF7970A_REG_IO_CTRL_VRS(0x1)); 1759 if (ret) 1760 goto out_err; 1761 1762 ret = trf7970a_write(trf, TRF7970A_NFC_LOW_FIELD_LEVEL, 1763 TRF7970A_NFC_LOW_FIELD_LEVEL_RFDET(0x3)); 1764 if (ret) 1765 goto out_err; 1766 1767 ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 1768 TRF7970A_NFC_TARGET_LEVEL_RFDET(0x7)); 1769 if (ret) 1770 goto out_err; 1771 1772 trf->ddev = ddev; 1773 trf->cb = cb; 1774 trf->cb_arg = arg; 1775 trf->timeout = timeout; 1776 trf->ignore_timeout = false; 1777 1778 ret = trf7970a_cmd(trf, TRF7970A_CMD_ENABLE_RX); 1779 if (ret) 1780 goto out_err; 1781 1782 trf->state = mode_detect ? TRF7970A_ST_LISTENING_MD : 1783 TRF7970A_ST_LISTENING; 1784 1785 schedule_delayed_work(&trf->timeout_work, msecs_to_jiffies(timeout)); 1786 1787 out_err: 1788 mutex_unlock(&trf->lock); 1789 return ret; 1790 } 1791 1792 static int trf7970a_tg_listen(struct nfc_digital_dev *ddev, u16 timeout, 1793 nfc_digital_cmd_complete_t cb, void *arg) 1794 { 1795 const struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1796 1797 dev_dbg(trf->dev, "Listen - state: %d, timeout: %d ms\n", 1798 trf->state, timeout); 1799 1800 return _trf7970a_tg_listen(ddev, timeout, cb, arg, false); 1801 } 1802 1803 static int trf7970a_tg_listen_md(struct nfc_digital_dev *ddev, 1804 u16 timeout, nfc_digital_cmd_complete_t cb, 1805 void *arg) 1806 { 1807 const struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1808 int ret; 1809 1810 dev_dbg(trf->dev, "Listen MD - state: %d, timeout: %d ms\n", 1811 trf->state, timeout); 1812 1813 ret = trf7970a_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, 1814 NFC_DIGITAL_RF_TECH_106A); 1815 if (ret) 1816 return ret; 1817 1818 ret = trf7970a_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, 1819 NFC_DIGITAL_FRAMING_NFCA_NFC_DEP); 1820 if (ret) 1821 return ret; 1822 1823 return _trf7970a_tg_listen(ddev, timeout, cb, arg, true); 1824 } 1825 1826 static int trf7970a_tg_get_rf_tech(struct nfc_digital_dev *ddev, u8 *rf_tech) 1827 { 1828 const struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1829 1830 dev_dbg(trf->dev, "Get RF Tech - state: %d, rf_tech: %d\n", 1831 trf->state, trf->md_rf_tech); 1832 1833 *rf_tech = trf->md_rf_tech; 1834 1835 return 0; 1836 } 1837 1838 static void trf7970a_abort_cmd(struct nfc_digital_dev *ddev) 1839 { 1840 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1841 1842 dev_dbg(trf->dev, "Abort process initiated\n"); 1843 1844 mutex_lock(&trf->lock); 1845 1846 switch (trf->state) { 1847 case TRF7970A_ST_WAIT_FOR_TX_FIFO: 1848 case TRF7970A_ST_WAIT_FOR_RX_DATA: 1849 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: 1850 case TRF7970A_ST_WAIT_TO_ISSUE_EOF: 1851 trf->aborting = true; 1852 break; 1853 case TRF7970A_ST_LISTENING: 1854 trf->ignore_timeout = !cancel_delayed_work(&trf->timeout_work); 1855 trf7970a_send_err_upstream(trf, -ECANCELED); 1856 dev_dbg(trf->dev, "Abort process complete\n"); 1857 break; 1858 default: 1859 break; 1860 } 1861 1862 mutex_unlock(&trf->lock); 1863 } 1864 1865 static const struct nfc_digital_ops trf7970a_nfc_ops = { 1866 .in_configure_hw = trf7970a_in_configure_hw, 1867 .in_send_cmd = trf7970a_send_cmd, 1868 .tg_configure_hw = trf7970a_tg_configure_hw, 1869 .tg_send_cmd = trf7970a_send_cmd, 1870 .tg_listen = trf7970a_tg_listen, 1871 .tg_listen_md = trf7970a_tg_listen_md, 1872 .tg_get_rf_tech = trf7970a_tg_get_rf_tech, 1873 .switch_rf = trf7970a_switch_rf, 1874 .abort_cmd = trf7970a_abort_cmd, 1875 }; 1876 1877 static int trf7970a_power_up(struct trf7970a *trf) 1878 { 1879 int ret; 1880 1881 dev_dbg(trf->dev, "Powering up - state: %d\n", trf->state); 1882 1883 if (trf->state != TRF7970A_ST_PWR_OFF) 1884 return 0; 1885 1886 ret = regulator_enable(trf->regulator); 1887 if (ret) { 1888 dev_err(trf->dev, "%s - Can't enable VIN: %d\n", __func__, ret); 1889 return ret; 1890 } 1891 1892 usleep_range(5000, 6000); 1893 1894 if (trf->en2_gpiod && 1895 !(trf->quirks & TRF7970A_QUIRK_EN2_MUST_STAY_LOW)) { 1896 gpiod_set_value_cansleep(trf->en2_gpiod, 1); 1897 usleep_range(1000, 2000); 1898 } 1899 1900 gpiod_set_value_cansleep(trf->en_gpiod, 1); 1901 1902 usleep_range(20000, 21000); 1903 1904 trf->state = TRF7970A_ST_RF_OFF; 1905 1906 return 0; 1907 } 1908 1909 static int trf7970a_power_down(struct trf7970a *trf) 1910 { 1911 int ret; 1912 1913 dev_dbg(trf->dev, "Powering down - state: %d\n", trf->state); 1914 1915 if (trf->state == TRF7970A_ST_PWR_OFF) 1916 return 0; 1917 1918 if (trf->state != TRF7970A_ST_RF_OFF) { 1919 dev_dbg(trf->dev, "Can't power down - not RF_OFF state (%d)\n", 1920 trf->state); 1921 return -EBUSY; 1922 } 1923 1924 gpiod_set_value_cansleep(trf->en_gpiod, 0); 1925 1926 if (trf->en2_gpiod && !(trf->quirks & TRF7970A_QUIRK_EN2_MUST_STAY_LOW)) 1927 gpiod_set_value_cansleep(trf->en2_gpiod, 0); 1928 1929 ret = regulator_disable(trf->regulator); 1930 if (ret) 1931 dev_err(trf->dev, "%s - Can't disable VIN: %d\n", __func__, 1932 ret); 1933 1934 trf->state = TRF7970A_ST_PWR_OFF; 1935 1936 return ret; 1937 } 1938 1939 static int trf7970a_startup(struct trf7970a *trf) 1940 { 1941 int ret; 1942 1943 ret = trf7970a_power_up(trf); 1944 if (ret) 1945 return ret; 1946 1947 pm_runtime_set_active(trf->dev); 1948 pm_runtime_enable(trf->dev); 1949 pm_runtime_mark_last_busy(trf->dev); 1950 1951 return 0; 1952 } 1953 1954 static void trf7970a_shutdown(struct trf7970a *trf) 1955 { 1956 switch (trf->state) { 1957 case TRF7970A_ST_WAIT_FOR_TX_FIFO: 1958 case TRF7970A_ST_WAIT_FOR_RX_DATA: 1959 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: 1960 case TRF7970A_ST_WAIT_TO_ISSUE_EOF: 1961 case TRF7970A_ST_LISTENING: 1962 trf7970a_send_err_upstream(trf, -ECANCELED); 1963 fallthrough; 1964 case TRF7970A_ST_IDLE: 1965 case TRF7970A_ST_IDLE_RX_BLOCKED: 1966 trf7970a_switch_rf_off(trf); 1967 break; 1968 default: 1969 break; 1970 } 1971 1972 pm_runtime_disable(trf->dev); 1973 pm_runtime_set_suspended(trf->dev); 1974 1975 trf7970a_power_down(trf); 1976 } 1977 1978 static int trf7970a_get_autosuspend_delay(const struct device_node *np) 1979 { 1980 int autosuspend_delay, ret; 1981 1982 ret = of_property_read_u32(np, "autosuspend-delay", &autosuspend_delay); 1983 if (ret) 1984 autosuspend_delay = TRF7970A_AUTOSUSPEND_DELAY; 1985 1986 return autosuspend_delay; 1987 } 1988 1989 static int trf7970a_probe(struct spi_device *spi) 1990 { 1991 const struct device_node *np = spi->dev.of_node; 1992 struct trf7970a *trf; 1993 int uvolts, autosuspend_delay, ret; 1994 u32 clk_freq = TRF7970A_13MHZ_CLOCK_FREQUENCY; 1995 1996 if (!np) { 1997 dev_err(&spi->dev, "No Device Tree entry\n"); 1998 return -EINVAL; 1999 } 2000 2001 trf = devm_kzalloc(&spi->dev, sizeof(*trf), GFP_KERNEL); 2002 if (!trf) 2003 return -ENOMEM; 2004 2005 trf->state = TRF7970A_ST_PWR_OFF; 2006 trf->dev = &spi->dev; 2007 trf->spi = spi; 2008 2009 spi->mode = SPI_MODE_1; 2010 spi->bits_per_word = 8; 2011 2012 ret = spi_setup(spi); 2013 if (ret < 0) { 2014 dev_err(trf->dev, "Can't set up SPI Communication\n"); 2015 return ret; 2016 } 2017 2018 if (of_property_read_bool(np, "irq-status-read-quirk")) 2019 trf->quirks |= TRF7970A_QUIRK_IRQ_STATUS_READ; 2020 2021 /* There are two enable pins - only EN must be present in the DT */ 2022 trf->en_gpiod = devm_gpiod_get_index(trf->dev, "ti,enable", 0, 2023 GPIOD_OUT_LOW); 2024 if (IS_ERR(trf->en_gpiod)) { 2025 dev_err(trf->dev, "No EN GPIO property\n"); 2026 return PTR_ERR(trf->en_gpiod); 2027 } 2028 2029 trf->en2_gpiod = devm_gpiod_get_index_optional(trf->dev, "ti,enable", 1, 2030 GPIOD_OUT_LOW); 2031 if (!trf->en2_gpiod) { 2032 dev_info(trf->dev, "No EN2 GPIO property\n"); 2033 } else if (IS_ERR(trf->en2_gpiod)) { 2034 dev_err(trf->dev, "Error getting EN2 GPIO property: %ld\n", 2035 PTR_ERR(trf->en2_gpiod)); 2036 return PTR_ERR(trf->en2_gpiod); 2037 } else if (of_property_read_bool(np, "en2-rf-quirk")) { 2038 trf->quirks |= TRF7970A_QUIRK_EN2_MUST_STAY_LOW; 2039 } 2040 2041 of_property_read_u32(np, "clock-frequency", &clk_freq); 2042 if ((clk_freq != TRF7970A_27MHZ_CLOCK_FREQUENCY) && 2043 (clk_freq != TRF7970A_13MHZ_CLOCK_FREQUENCY)) { 2044 dev_err(trf->dev, 2045 "clock-frequency (%u Hz) unsupported\n", clk_freq); 2046 return -EINVAL; 2047 } 2048 2049 if (clk_freq == TRF7970A_27MHZ_CLOCK_FREQUENCY) { 2050 trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_27MHZ; 2051 dev_dbg(trf->dev, "trf7970a configured for 27MHz crystal\n"); 2052 } else { 2053 trf->modulator_sys_clk_ctrl = 0; 2054 } 2055 2056 ret = devm_request_threaded_irq(trf->dev, spi->irq, NULL, 2057 trf7970a_irq, 2058 IRQF_TRIGGER_RISING | IRQF_ONESHOT, 2059 "trf7970a", trf); 2060 if (ret) { 2061 dev_err(trf->dev, "Can't request IRQ#%d: %d\n", spi->irq, ret); 2062 return ret; 2063 } 2064 2065 mutex_init(&trf->lock); 2066 INIT_DELAYED_WORK(&trf->timeout_work, trf7970a_timeout_work_handler); 2067 2068 trf->regulator = devm_regulator_get(&spi->dev, "vin"); 2069 if (IS_ERR(trf->regulator)) { 2070 ret = PTR_ERR(trf->regulator); 2071 dev_err(trf->dev, "Can't get VIN regulator: %d\n", ret); 2072 goto err_destroy_lock; 2073 } 2074 2075 ret = regulator_enable(trf->regulator); 2076 if (ret) { 2077 dev_err(trf->dev, "Can't enable VIN: %d\n", ret); 2078 goto err_destroy_lock; 2079 } 2080 2081 uvolts = regulator_get_voltage(trf->regulator); 2082 if (uvolts > 4000000) 2083 trf->chip_status_ctrl = TRF7970A_CHIP_STATUS_VRS5_3; 2084 2085 trf->regulator = devm_regulator_get(&spi->dev, "vdd-io"); 2086 if (IS_ERR(trf->regulator)) { 2087 ret = PTR_ERR(trf->regulator); 2088 dev_err(trf->dev, "Can't get VDD_IO regulator: %d\n", ret); 2089 goto err_destroy_lock; 2090 } 2091 2092 ret = regulator_enable(trf->regulator); 2093 if (ret) { 2094 dev_err(trf->dev, "Can't enable VDD_IO: %d\n", ret); 2095 goto err_destroy_lock; 2096 } 2097 2098 if (regulator_get_voltage(trf->regulator) == 1800000) { 2099 trf->io_ctrl = TRF7970A_REG_IO_CTRL_IO_LOW; 2100 dev_dbg(trf->dev, "trf7970a config vdd_io to 1.8V\n"); 2101 } 2102 2103 trf->ddev = nfc_digital_allocate_device(&trf7970a_nfc_ops, 2104 TRF7970A_SUPPORTED_PROTOCOLS, 2105 NFC_DIGITAL_DRV_CAPS_IN_CRC | 2106 NFC_DIGITAL_DRV_CAPS_TG_CRC, 0, 2107 0); 2108 if (!trf->ddev) { 2109 dev_err(trf->dev, "Can't allocate NFC digital device\n"); 2110 ret = -ENOMEM; 2111 goto err_disable_regulator; 2112 } 2113 2114 nfc_digital_set_parent_dev(trf->ddev, trf->dev); 2115 nfc_digital_set_drvdata(trf->ddev, trf); 2116 spi_set_drvdata(spi, trf); 2117 2118 autosuspend_delay = trf7970a_get_autosuspend_delay(np); 2119 2120 pm_runtime_set_autosuspend_delay(trf->dev, autosuspend_delay); 2121 pm_runtime_use_autosuspend(trf->dev); 2122 2123 ret = trf7970a_startup(trf); 2124 if (ret) 2125 goto err_free_ddev; 2126 2127 ret = nfc_digital_register_device(trf->ddev); 2128 if (ret) { 2129 dev_err(trf->dev, "Can't register NFC digital device: %d\n", 2130 ret); 2131 goto err_shutdown; 2132 } 2133 2134 return 0; 2135 2136 err_shutdown: 2137 trf7970a_shutdown(trf); 2138 err_free_ddev: 2139 nfc_digital_free_device(trf->ddev); 2140 err_disable_regulator: 2141 regulator_disable(trf->regulator); 2142 err_destroy_lock: 2143 mutex_destroy(&trf->lock); 2144 return ret; 2145 } 2146 2147 static int trf7970a_remove(struct spi_device *spi) 2148 { 2149 struct trf7970a *trf = spi_get_drvdata(spi); 2150 2151 mutex_lock(&trf->lock); 2152 2153 trf7970a_shutdown(trf); 2154 2155 mutex_unlock(&trf->lock); 2156 2157 nfc_digital_unregister_device(trf->ddev); 2158 nfc_digital_free_device(trf->ddev); 2159 2160 regulator_disable(trf->regulator); 2161 2162 mutex_destroy(&trf->lock); 2163 2164 return 0; 2165 } 2166 2167 #ifdef CONFIG_PM_SLEEP 2168 static int trf7970a_suspend(struct device *dev) 2169 { 2170 struct spi_device *spi = to_spi_device(dev); 2171 struct trf7970a *trf = spi_get_drvdata(spi); 2172 2173 mutex_lock(&trf->lock); 2174 2175 trf7970a_shutdown(trf); 2176 2177 mutex_unlock(&trf->lock); 2178 2179 return 0; 2180 } 2181 2182 static int trf7970a_resume(struct device *dev) 2183 { 2184 struct spi_device *spi = to_spi_device(dev); 2185 struct trf7970a *trf = spi_get_drvdata(spi); 2186 int ret; 2187 2188 mutex_lock(&trf->lock); 2189 2190 ret = trf7970a_startup(trf); 2191 2192 mutex_unlock(&trf->lock); 2193 2194 return ret; 2195 } 2196 #endif 2197 2198 #ifdef CONFIG_PM 2199 static int trf7970a_pm_runtime_suspend(struct device *dev) 2200 { 2201 struct spi_device *spi = to_spi_device(dev); 2202 struct trf7970a *trf = spi_get_drvdata(spi); 2203 int ret; 2204 2205 mutex_lock(&trf->lock); 2206 2207 ret = trf7970a_power_down(trf); 2208 2209 mutex_unlock(&trf->lock); 2210 2211 return ret; 2212 } 2213 2214 static int trf7970a_pm_runtime_resume(struct device *dev) 2215 { 2216 struct spi_device *spi = to_spi_device(dev); 2217 struct trf7970a *trf = spi_get_drvdata(spi); 2218 int ret; 2219 2220 ret = trf7970a_power_up(trf); 2221 if (!ret) 2222 pm_runtime_mark_last_busy(dev); 2223 2224 return ret; 2225 } 2226 #endif 2227 2228 static const struct dev_pm_ops trf7970a_pm_ops = { 2229 SET_SYSTEM_SLEEP_PM_OPS(trf7970a_suspend, trf7970a_resume) 2230 SET_RUNTIME_PM_OPS(trf7970a_pm_runtime_suspend, 2231 trf7970a_pm_runtime_resume, NULL) 2232 }; 2233 2234 static const struct of_device_id trf7970a_of_match[] = { 2235 {.compatible = "ti,trf7970a",}, 2236 {}, 2237 }; 2238 2239 MODULE_DEVICE_TABLE(of, trf7970a_of_match); 2240 2241 static const struct spi_device_id trf7970a_id_table[] = { 2242 {"trf7970a", 0}, 2243 {} 2244 }; 2245 2246 MODULE_DEVICE_TABLE(spi, trf7970a_id_table); 2247 2248 static struct spi_driver trf7970a_spi_driver = { 2249 .probe = trf7970a_probe, 2250 .remove = trf7970a_remove, 2251 .id_table = trf7970a_id_table, 2252 .driver = { 2253 .name = "trf7970a", 2254 .of_match_table = of_match_ptr(trf7970a_of_match), 2255 .pm = &trf7970a_pm_ops, 2256 }, 2257 }; 2258 2259 module_spi_driver(trf7970a_spi_driver); 2260 2261 MODULE_AUTHOR("Mark A. Greer <mgreer@animalcreek.com>"); 2262 MODULE_LICENSE("GPL v2"); 2263 MODULE_DESCRIPTION("TI trf7970a RFID/NFC Transceiver Driver"); 2264